Vibration reduction device, lifting mechanism and truck-mounted crane

Abstract

The invention relates to a vibration damper, a lifting mechanism and a truck-mounted crane. The vibration damper comprises a supporting piece, a first connecting piece and a second connecting piece, afirst pressure cavity and a second pressure cavity are formed in the supporting piece, a switch assembly is arranged between the first pressure cavity and the second pressure cavity, the first end ofthe first connecting piece is arranged in the first pressure cavity, and the first end of the second connecting piece is arranged in the second pressure cavity; when the switch assembly is in a closed state, a flow path between the first pressure cavity and the second pressure cavity is disconnected; and when the switch assembly is in an open state, the flow path between the first pressure cavityand the second pressure cavity is connected so as to buffer the impact vibration borne by at least one of the first connecting piece and the second connecting piece. According to the vibration damper, the lifting mechanism and the truck-mounted crane, various damping effects such as a small damping effect and a large damping effect can be generated, and the vibration reduction effect is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a vibration damping device, a lifting mechanism and a truck-mounted crane. Background technique [0002] When the telescopic arm of the existing lifting mechanism falls rapidly and stops suddenly, the pressure of the basic arm oil cylinder will increase sharply, causing the oil cylinder to rebound and reciprocate, causing the cantilever beam structure of the telescopic arm to produce severe impact vibration and large swing, not only It will affect the operating efficiency, and at the same time, it will endanger the safety of the operating personnel and the reliability of the vehicle lifting equipment. [0003] The existing damping device increases the flow (pressure relief) of the oil circuit and increases the reversing time to reduce the pressure change rate and reduce the impact generation, but the damping state formed by this method is single, and the damping effect is gen...

AI Technical Summary

Problems solved by technology

[0002] When the telescopic arm of the existing lifting mechanism falls rapidly and stops suddenly, the pressure of the basic arm oil cylinder will increase sharply, causing the oil cylinder to rebound and reciprocate, causing the cantilever beam structure of the telescopic arm to produce severe impact vibration and large swing, not only It will affect the operation efficiency, and at the same time, it will endanger the safety of the operators and the reliability of the lifting equipment of the whole vehicle

[0003] The existing vibration damping device increases the flow (pressure relief) of the oil circuit and increases the reversing time to reduce the pressure change rate and reduce the impact. However, the damping state formed by this method is single, and the vibration damping effect is general.

Moreover, the impact excitation and vibration of the telescopic boom are only generated under specific working conditions of the truck-mounted crane. If the pressure is relieved in advance, it will affect the lifting capacity of the telescopic boom and the stability of the operation.

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